For example, consider electron–positron annihilation, in which the rest mass of individual particles is destroyed, but the inertia equivalent of the system of the two particles (its invariant mass) remains (since all energy is associated with mass), and this inertia and invariant mass is carried off by photons which individually are massless, but as a system retain their mass. This is a reversible process – the inverse process is called pair creation – in which the rest mass of particles is created from energy of two (or more) annihilating photons. In this system the matter (electrons and positrons) is destroyed and changed to non-matter energy (the photons). However, the total system mass and energy do not change during this interaction.
What is the inverse process called?
pair creation

During the English Civil War Plymouth sided with the Parliamentarians and was besieged for almost four years by the Royalists. The last major attack by the Royalist was by Sir Richard Grenville leading thousands of soldiers towards Plymouth, but they were defeated by the Plymothians at Freedom Fields Park. The civil war ended as a Parliamentary win, but monarchy was restored by King Charles II in 1660, who imprisoned many of the Parliamentary heroes on Drake's Island. Construction of the Royal Citadel began in 1665, after the Restoration; it was armed with cannon facing both out to sea and into the town, rumoured to be a reminder to residents not to oppose the Crown. Mount Batten tower also dates from around this time.
Which faction did Plymouth support during the English Civil War?
Parliamentarians

At the end of the third quarter in 2008, Florida had the highest mortgage delinquency rate in the country, with 7.8% of mortgages delinquent at least 60 days. A 2009 list of national housing markets that were hard hit in the real estate crash included a disproportionate number in Florida. The early 21st-century building boom left Florida with 300,000 vacant homes in 2009, according to state figures. In 2009, the US Census Bureau estimated that Floridians spent an average 49.1% of personal income on housing-related costs, the third highest percentage in the country.
Where did housing spending ranking nationally 

the third highest percentage in the country